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Bi Cocatalyst/Bi2MoO6 Microspheres Nanohybrid with SPR-Promoted Visible-Light Photocatalysis
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2016-05-26 00:00:00 , DOI: 10.1021/acs.jpcc.6b01188 Zaiwang Zhao 1 , Wendong Zhang 2 , Yanjuan Sun 1 , Jiayan Yu 3 , Yuxin Zhang 4 , Hong Wang 1 , Fan Dong 1 , Zhongbiao Wu 5
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2016-05-26 00:00:00 , DOI: 10.1021/acs.jpcc.6b01188 Zaiwang Zhao 1 , Wendong Zhang 2 , Yanjuan Sun 1 , Jiayan Yu 3 , Yuxin Zhang 4 , Hong Wang 1 , Fan Dong 1 , Zhongbiao Wu 5
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To develop efficient visible light driven photocatalysts for air purification, we constructed a novel semimetal–semiconductor Bi–Bi2MoO6 (Bi–Mo) nanohybrid via the in situ deposition of Bi nanoparticles on the surface of Bi2MoO6 microspheres. In this strategy, the Bi3+ ions were in situ reduced to metallic Bi particles by glucose during in hydrothermal process. The XRD, XPS, SEM, TEM, UV–vis, DRS, PL spectra, and surface photovoltage were employed to explore the structural and optical properties. The as-synthesized Bi–Bi2MoO6 nanohybrid was applied in photocatalytic removal of NO in air. The results indicated that the amount of reductive glucose not only exerted a pivotal effect on the morphological structure but also affected the photocatalytic capability of the Bi–Bi2MoO6 nanohybrid. The optimized Bi–Mo-50 hybrids exhibited exceptionally high visible-light photocatalytic performance with a NO removal ratio up to 68.1%, far outperforming other decent photocatalysts, like BiOBr (21.3%), C-doped TiO2 (21.8%), N-doped TiO2 (36.5%), N-doped (BiO)2CO3 (43.5%), and g-C3N4 (32.7%). This drastically enhanced photocatalytic capability was ascribed to the cocontributions of the enhanced light absorption and the improved separation efficiency of the charge carriers owing to the surface plasmon resonance (SPR) induced by Bi metal. The Bi metal performs as noble metal-like cocatalyst for promoting the photocatalysis efficiency. Based on the DMPO-ESR spin trapping, the active species generated from Bi/Bi2MoO6 under visible light were •OH radicals. The Bi/Bi2MoO6 produced more •OH radicals contributing to strengthen oxidation ability in comparison with that of the pristine Bi2MoO6. In addition, this advanced Bi/Bi2MoO6 nanohybrid also exhibited high photochemical stability under repeated irradiation. This work demonstrated the feasibility of utilizing economical Bi element as a cocatalyst to substitute the precious noble metals to advance the photocatalysis efficiency.
中文翻译：
Bi助催化剂/ Bi 2 MoO 6微球纳米杂化与SPR促进可见光光催化
为了开发用于空气净化的有效可见光驱动的光催化剂，我们通过在Bi 2 MoO 6微球表面上原位沉积Bi纳米粒子，构建了一种新型的半金属-Bi-Bi 2 MoO 6（Bi-Mo）纳米杂化物。在这种策略中，在水热过程中，葡萄糖将Bi 3+离子原位还原为金属Bi颗粒。利用XRD，XPS，SEM，TEM，UV-vis，DRS，PL光谱和表面光电压来研究结构和光学性质。合成后的Bi–Bi 2 MoO 6纳米杂化技术应用于光催化去除空气中的NO。结果表明，还原性葡萄糖的含量不仅对形态结构起关键作用，而且还影响了Bi–Bi 2 MoO 6纳米杂化物的光催化能力。经过优化的Bi-Mo-50杂化体表现出极高的可见光光催化性能，其NO去除率高达68.1％，远胜于其他类似的光催化剂，如BiOBr（21.3％），C掺杂的TiO 2（21.8％），N掺杂的TiO 2（36.5％），氮掺杂的（BiO）2 CO 3（43.5％）和gC 3 N 4（32.7％）。这种急剧增强的光催化能力归因于由于Bi金属引起的表面等离振子共振（SPR）而导致的光吸收增强和电荷载流子分离效率提高的共同贡献。Bi金属用作贵金属状助催化剂以提高光催化效率。基于DMPO-ESR自旋阱，Bi / Bi 2 MoO 6在可见光下产生的活性物质为• OH自由基。与原始的Bi 2 MoO 6相比，Bi / Bi 2 MoO 6产生更多的• OH基，有助于增强氧化能力。。另外，这种先进的Bi / Bi 2 MoO 6纳米杂化物在重复照射下也显示出高的光化学稳定性。这项工作证明了利用经济的Bi元素作为助催化剂替代贵重贵金属以提高光催化效率的可行性。
更新日期：2016-05-26
中文翻译：
Bi助催化剂/ Bi 2 MoO 6微球纳米杂化与SPR促进可见光光催化
为了开发用于空气净化的有效可见光驱动的光催化剂，我们通过在Bi 2 MoO 6微球表面上原位沉积Bi纳米粒子，构建了一种新型的半金属-Bi-Bi 2 MoO 6（Bi-Mo）纳米杂化物。在这种策略中，在水热过程中，葡萄糖将Bi 3+离子原位还原为金属Bi颗粒。利用XRD，XPS，SEM，TEM，UV-vis，DRS，PL光谱和表面光电压来研究结构和光学性质。合成后的Bi–Bi 2 MoO 6纳米杂化技术应用于光催化去除空气中的NO。结果表明，还原性葡萄糖的含量不仅对形态结构起关键作用，而且还影响了Bi–Bi 2 MoO 6纳米杂化物的光催化能力。经过优化的Bi-Mo-50杂化体表现出极高的可见光光催化性能，其NO去除率高达68.1％，远胜于其他类似的光催化剂，如BiOBr（21.3％），C掺杂的TiO 2（21.8％），N掺杂的TiO 2（36.5％），氮掺杂的（BiO）2 CO 3（43.5％）和gC 3 N 4（32.7％）。这种急剧增强的光催化能力归因于由于Bi金属引起的表面等离振子共振（SPR）而导致的光吸收增强和电荷载流子分离效率提高的共同贡献。Bi金属用作贵金属状助催化剂以提高光催化效率。基于DMPO-ESR自旋阱，Bi / Bi 2 MoO 6在可见光下产生的活性物质为• OH自由基。与原始的Bi 2 MoO 6相比，Bi / Bi 2 MoO 6产生更多的• OH基，有助于增强氧化能力。。另外，这种先进的Bi / Bi 2 MoO 6纳米杂化物在重复照射下也显示出高的光化学稳定性。这项工作证明了利用经济的Bi元素作为助催化剂替代贵重贵金属以提高光催化效率的可行性。
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